Here is what you have to do
1. Create a new theme inside App_Data/Sitefinity/WebsiteTemplates/PageTemplates/App_Themes
2. Inside the Theme create a folder called Global
3. In this folder put your stylesheet with some content
4. Go to the backend of Sitefinity >> Page Templates and set a template to use your custom theme
5. Drop RadMenu control on a page and set
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